1968 tube caddy; tube substitution guidebook

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100 1 ‡aMiddleton, Herman Arnold.
245 1 0 ‡a1968 tube caddy; ‡btube substitution guidebook.
260 ‡aNew York, ‡bHayden Book Co. ‡c[1968]
300 ‡a139 p.
538 ‡aMode of access: Internet.
650 0 ‡aElectron tubes.
740 0 ‡aTube substitution guidebook.
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